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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54a50305b6d3225260655b93f25c553f0c9d20987df3ae7cb3eafd8307f1ad1d' 
  AND token = 'n9s3s1IrF9HuChvrjKnY7G32ngv6PZT7U9eW8iEKikM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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