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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '964809e5002fc508742b9717a2879926d6aa2dd4702a8e87d813bf5cf72b5956' 
  AND token = 'qbmEecy4OW8fF2mzElnFJI6CTsXdglp/lV27TFPFmEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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