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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fc76135c22055a29d69ba707c0f85b56651aced5bfdfe5c04b956abb7f5a333' 
  AND token = '2OMP5XB/6yfduU6nN33yEQhIh2d8fcQXsWUzvWb0fCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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