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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '505015963e205952c6e7d0aa8ec4a190b353581b53ca576373f12307591f8528' 
  AND token = 'n6mlXnlWrCXIdfEOniaCK9h9zhqj7+AyCyxxiB5gnAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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