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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaace4fa17b11f992fd71dae994572679c1eb6b8500cc385d0d659e8430644fa' 
  AND token = 'Hp9lV7u3bG5BMQrFtaOil8Xemzzp59xyD7QonpRPp5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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