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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5eb7e3892fab5a8632e6a581f082eeec3d95c35c389fb454b49eb91e11e999ad' 
  AND token = 'AbJ8l7GtX0KdPx2KqpE8NZmypI0XTkM/NM2kFBSuK5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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