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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02b543939527d82b1a8e3de9cdc549b30acd75ab06ad7048319bb368bc1f860d' 
  AND token = 'LWGeC564FvtH6UtICkVU8R0LmNmwg5/LNUG6WUBJ8Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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