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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a085b4dcdd20cda4a7e8b55f594aa70566d8427b747a9e61676b7ed74fa7effe' 
  AND token = 'fUYnFMWbC6VMMNHpcQ7J+UZY9YC5Bu8HTOnDlyLG2rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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