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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2fc041a590e230e49ffd61847a8a7f925858b8aeb8a240000811362901a69b0' 
  AND token = '7WQJ7GFQ3cLiCFELAhNJ8pn+3C6h0GLPepNe/wwwWUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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