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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '850069ed65a98c95355f8845a4f8c86ecb49aacfa2bd25c1665b1f1f5e3e08f7' 
  AND token = 'FlNO1O9IuBOksD/8AqRzaMPoXY/+aIsccCBzDlfisKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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