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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43e503b55da13a8c15481b9bd553d6c80e64d7c45a7409356952553a43693d48' 
  AND token = 'DM01AeKuMLP+90MOYuarnElt+KWzQZ+2aaQFod+tQ8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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