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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98b2a9cdf01272dfbea32f6488f91a2ff1b647a05ebf152de6a9127365b3b738' 
  AND token = 'IrmGBbqZPKORki5jium7kVqO+ka1mt9gDF50668heTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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