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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ec0407b5eb2b85c7533942a307649a29387c97c12b2a00a2fa3b5f326575ca5' 
  AND token = '50RjDqStm8rICHcb9EWV7uPjLVK5zBUr4sTsUashvM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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