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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ac8aef2ee9e88b0ca8f898eb9819ac2da15aae997b637ec3c87231bb6bf33a8' 
  AND token = 'Kv6Zubyk7iIOrtuyKdiniqF0lBVXA0U2cgr0LhrWPjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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