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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab4cfe210d05bf3cf9f9a51759f35b8774abaa2bf46931a8a4759c9faf4004fb' 
  AND token = 'e2C8OTZN36612jdtcIwAtwkZOkHXo60QF6pksG3NxnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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