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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c73e00f97171901f37843c9eb8dc20fd2e9601dfcf782e486222bb1ff9bf055' 
  AND token = 'a5Az9f7T524qYfkbu2ShwPKFnnomvtV4mIaadgQt9mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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