SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e940ac82f8249e883f4d24e194a6ca46521863aaf67d509273b2688ca2f9618a' 
  AND token = 'Zp4hF7UdQYamxAbCXkVrmNS6ulGkngJ3zXp8MA1He/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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