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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08cd0ff78345b359a4bf0d989104a0f06d396d0e4ba23e54c6cadd92b74f9802' 
  AND token = 'dwHA5iFhmGtZnqz8se1YXr3QpSNbzqmqxQ6at5EGqF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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