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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dc9d2778720073ddb6a3981a6f62356d52016669ebae52f0c5d1b26c5c24d2b' 
  AND token = 'HhKzU3GVfwOYJxpNXceP60Jb17Dxt7U5xex59qYazkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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