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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d83656a17cfa772775f06a64a77440e4326b84516f70b3e4b1b28129b2f502e' 
  AND token = '61101y/FppMX61JipM1Jfj6Rp6yhyKCBrn7jDmdlfEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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