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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3cb81b4a53bbb7adf1b058debf1d6366c03477d68d98f6b9725f7befbb52c75' 
  AND token = 'Wkw7tVFnXVV3HoigyZ9+13IETy0LPmNHaf4dD+QKH4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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