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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccf9a1a119ccc263aae42d0622aacc317c4801143eca4919619889b034b5d840' 
  AND token = 'pOQOUlRX6i4TxLXITqSxKjrbonIhK5b6o2Mc9yxNvsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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