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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fe7c16712e1c60e0623e9c253fae94c83b6a064de638c00ad1654a48a28ff96' 
  AND token = 'o6GgZEaBnqOIma0jKHVBOMjR9hyO8sLzUbXGNmHe6j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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