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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4e29353ed08d57041450be8702f0b622fa3ddb04414939ad1bdac9fe0bf8fc2' 
  AND token = 'BexNlaeD8mxT/qUahI0aKIGRhmvyO6bzU6A8dSXP3rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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