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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd07a23805eac6a7b6b8822951c82e85ffa06dde6358aa7258ebe8a259eac4c61' 
  AND token = 'Lort0LxLBbWROR6BD2Gg7UohkeycoNKMuIas97l0NhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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