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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c822bcd46c09741981fbcb5552d0499e0cae335c77be88940a6d8fb21515ac39' 
  AND token = 'H5f9Zq8DuZPwZpJCZ4ycJdO4zX3WpsXD2eA5C4q35sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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