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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c63d15d59d4792f0f87d40ec44e73a4b66a5e2d25e77b6323682ca216caa6fb5' 
  AND token = 'GubGlVb6MuQcLtW/Qnr8EMYBEv8mzNSS7i+c3fAh3dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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