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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e013eb35ae9641b9fa3ebdb53cb03cd23da77ef58fa9e0c79e92ef886fb26495' 
  AND token = 'cTL+ifRL1sFQABCOyyntGz4pgEr2HYO77xd4/ff1ZTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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