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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3e59cb0f6290a0eb76dbda850a3f6de420d75763fe31c0ad9398a220de6ec09' 
  AND token = 'pf6p0LFHBW/FTkbEBdMZAor+5bkGhCKaXZBFldJWeq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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