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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '201cf4f179e617600f61a80fc5231a78b7f346d5a9c50dd2f4771c609d9f9538' 
  AND token = 'fkzVChyOFiA0fjJJRlLxDAt79WKk5pl3vo3Ot3GkqSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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