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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40de2792830ec3c99dbe623621bd9e6e49ef9077efd148f6d041f067f10ec360' 
  AND token = 'klu5lrIGA9Rqxmv0qAVztbk4ZVKPn1bRL8givR8kxOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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