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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2e6f55d9485c018ece83641acc3181c10ec7f34443d491ee70b618ddfd75bdf' 
  AND token = '+wj5t72WKrhBarBTT4VwB6YOIk2UXz0bniTY8ZufkYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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