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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7caf9161dd9aff17ca3eaba142be57aed449ef6c183560a3d2bccec4e01a68ac' 
  AND token = 'r54w7X4vCrBZfpFJL1XZIFyIk0cPShcuA5UISEGwSWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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