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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fcd6d7bf4be94150b1407ca49afb0988c4fede03169d90df705c7d5bb0908a0' 
  AND token = 'dDsaI42I6mqZ0UPFt5GeQ/ClhMVl1tlWDsOFM75k8dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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