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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2be274957e05570ac53402f5f6ba3f29523d0e626deca018f78ab940fb457e2d' 
  AND token = 'Oh9kvRYf1CGZJeCtEaGD5mdbUyrGlqiwnqkxWExy0rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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