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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ef3896b789b81b84b7fb51f1ea2bac671f8bc260e40fb027c7cc9926683c812' 
  AND token = '9sgudlgFy0y2mZum1LdBT8CCzIuvNTVaidRfs9DerV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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