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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6123a55bc2dbd387458ad8a1bee274dc2544fbee1fbad440e06c61002509922f' 
  AND token = 'cazY1iTdPkYHSUPCMXbxRsEOGWkk5r28COxdpH6f7pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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