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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a53d42706003de527fdc7eaac1ceb87b3a8c4ae837415367d95bcbbc7cad70e3' 
  AND token = 'jqIbZU59pXo8Vwe+ZNjFj6ZfGm1mPPxOsz06e1Gy1ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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