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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '378812d0b7abfebc4fc26af8d1eb5884cb3b1b8932cc93e822b1d77039b509a6' 
  AND token = 'd7xr+0V4j+VtYJbrxfYeWrivggpmf1QQrFfHkSxI0Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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