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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c4bf713e95bcbe38298966eccb966fa758ef7c1009bf77a2bdcf242411db483' 
  AND token = 'qnXQG+/0HSOPy5+3opRbQEOcsXdTcsM2JRq9WJU3lGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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