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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3777448a8145e96fbd91d076f6ff338098fc13f5e74d310355d5ecdc984c43d7' 
  AND token = '/87P8bd2mMNSVqGsxRKxTlwV2RdJ01fQOdy/cYUrq0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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