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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e59eb929c59f99a728f47398a757c5fa1367bcd2483c6052661151b70eccdb5' 
  AND token = 'H65y93owwa7rJlTaadSV/VAtJi4xog90tf6gz5w+/JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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