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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e6ae32eb1afaa46e98bc200ed3595a3d70e3b66bd848f0d5479d8bc3122320a' 
  AND token = 'f1KbjUrflwGptUt6lMNSPvPQWHrNw0NEHkEggbLtBgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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