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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dbde5825bf504d444370a9c8d017220c30c9a349095e3fbb251470a92bd5d2c' 
  AND token = 'abb8Lce7Vz8HXBCysOroijsQZwK6Xmnkttg5+yvkTEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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