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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79b53871c96bad586159c585840017247d6de96fad91c156bc06a8568e5c71cd' 
  AND token = 'NKKkagee/Vc97T65JiiB+d9Z0VTLDxTwJKSNfCZW/CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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