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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b3c0717fce324d1567f8f67c1d97e9df1b3a6bc9ebeb3b79b379d7ee37075fc' 
  AND token = 'ktqXrm+Xius6x6mAC0224Jh/qynavPhLfAzID0FAQhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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