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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad21b82e856094ed89ad80b41ccfc4778fa1ce800787a6e9310df42c2aa52644' 
  AND token = 'XHpVi4uaeaGyAhBCIal0ilJQ+8UlYP4uq98/53XPcQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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