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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eba3603e9366e21c9cab223801595dd92c8609a2d96aa41fd68d48fa716936cc' 
  AND token = 'IfPFK2Yoj9Ayu8KLP8nvetrMsFtMEjuJyIGiGQQyQHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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