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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b102a4fc567476cab44e34293888a595d0601763550d2a4e39bf861da1051644' 
  AND token = 'BUEs8Ch/bIzBNBTPdXZscNQQ8U2GBevz4XRI9uXPkzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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