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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79e823f4af141ddb03b96fe8e5038a9379879e319c7ebaec470b0e96f8426f17' 
  AND token = 'I/YhdDrE19Lo8aymH0z//34xwbmGkVCeXjl0i0w+HDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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