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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6e6a193c02f96815bb69b27ee66fc7c62302956568fa0c41c0ddd8e17e632ac' 
  AND token = 'QYEMzClXgCAf2T14ELHosY3rK8OlQqqXGF934xtR2RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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