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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6506566fee285c25b5987a61e5c204dba3eb47729a7282d0627a73cf3c4cdea3' 
  AND token = '9X4wmeIomFsIjJbJf2bkGM4sOx+kn13MZCkjsd3tEdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}