SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6064b52c5e789db7b8ce431648f7cb58d6bde20d7b8053c90a9b032858c2f0d7' 
  AND token = 'Xdgbvad+gDePCTuZ2VrGhbBC3hJu/sD0flbXnfNWKK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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