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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c63dc6da57a5dfccc5222ba3cc939cbc522909bd7caf14273774a557790359d' 
  AND token = 'WQy5pMsm8vbd4ljwor6dsWy8nnB1F1FE70K4bh434hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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