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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e68ba29bb263ae3a5b9574cd81fdb617d9986188638bf34cfa60a26a651b0829' 
  AND token = 'nEe/sIc8aLTfa6DKLf3Y7R2l2zVdZ0GZaEOwhxlw+aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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