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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bdee167a1baf0ea4d60d538284e3efa1b860b7eb283236ec53e4e2d470d9262' 
  AND token = 'D5aBpMj0fLMytnkslZ2QYweLW5tPwU7MzPlg02wKtWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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