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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b902da3a10a2adfc82c7596ce2f40d5d347a6ef640ee1ab0db012aaa10d8964' 
  AND token = 'b4CUANNG/vSWE4MNfecyjmNlw6KCUcrP3XKlxZ8PziM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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