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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9e5c444a9860c196db061be6e19e2d89711aa1e4469b12f5bcf82dc4db03409' 
  AND token = 'Lpjh+IjxpzNvYV1iGrjmJQN9Qon6If3AuQ0mWRrXxr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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