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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd91ae751790b932810a3f682bd7b0ee4025519f3e9713c748a4ccb7244b17a0' 
  AND token = 'OI8fxlxbaaWnR6AzrLUmLkPi6+3YPvgoNfvRGjSf/y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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