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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04d10473e07a9246a934b60902808af65db98234f9d5d09a99a519bbeace3b0d' 
  AND token = 'UsFxsvnP355rBd6wmcBKqGTMvBX+13PnIsYVbCso2Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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