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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e53470f2e44adbe5dafa16e45368e056445a24d1ad3094df643d9de3fc875f11' 
  AND token = 'vM6VTKzLm79+IwAxYm2lpl6E1IaRcp1Y+pQ6wrgZNB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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